Ping-Pong-Game/game.html at master · ShyamPraveenSingh/Ping-Pong-Game · GitHub

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<html>
<canvas id = "gameCanvas" width="800" height="600"></canvas>
<script>
var canvas;
var canvasContext;
var ballX = 50;
var ballY = 50;
var ballSpeedX = 10;
var ballSpeedY = 4;

var player1Score = 0;
var player2Score = 0;
const WINNING_SCORE = 5;

var showingWinScreen = false;

var paddle1Y = 250;
var paddle2Y = 250;
const PADDLE_HEIGHT = 100;
const PADDLE_THICKNESS = 10;

function calculateMousePos(evt){

		var rect = canvas.getBoundingClientRect();
		var root = document.documentElement;
		var mouseX = evt.clientX - rect.left - root.scrollLeft;
		var mouseY = evt.clientY - rect.top - root.scrollTop;
		return{
			x:mouseX,
			y:mouseY
		};

}

function handleMouseClick(evt){
	if(showingWinScreen){
		player1Score = 0;
		player2Score = 0;
		showingWinScreen = false;
	}
}

window.onload = function(){

	canvas = document.getElementById('gameCanvas');
	canvasContext = canvas.getContext('2d');

	var framesPersecond = 30;
	setInterval(function(){
		moveEverything();
		drawEverything();
	}, 1000/framesPersecond);

	canvas.addEventListener('mousedown',handleMouseClick)

	canvas.addEventListener('mousemove',
		function(evt){
			var mousePos = calculateMousePos(evt);
			paddle1Y = mousePos.y - (PADDLE_HEIGHT/2);
		});
}

function ballReset(){

	if(player1Score >= WINNING_SCORE || player2Score >= WINNING_SCORE){


		showingWinScreen = true;
	}

	ballSpeedX = -ballSpeedX;
	ballX = canvas.width/2;
	ballY = canvas.height/2;
}

function computerMovement(){
	var paddle2YCenter = paddle2Y + (PADDLE_HEIGHT/2);
	if (paddle2YCenter < ballY-35){
		paddle2Y += 6;
	}else if(paddle2YCenter > ballY+35){
		paddle2Y -= 6;
	}
}

function moveEverything(){


	if(showingWinScreen){
		return;
	}

	computerMovement();

	ballX += ballSpeedX;
	ballY += ballSpeedY;

	if(ballX < 0) {
		if(ballY  > paddle1Y &&
			ballY < paddle1Y + PADDLE_HEIGHT){
				ballSpeedX = -ballSpeedX;

				var deltaY = ballY - (paddle1Y+PADDLE_HEIGHT/2);
				ballSpeedY = deltaY * 0.35;
		}
		else{

			player2Score++;
			ballReset();

		}
	}

	if(ballX > canvas.width){
		if(ballY  > paddle2Y &&
			ballY < paddle2Y + PADDLE_HEIGHT){
				ballSpeedX = -ballSpeedX;

				var deltaY = ballY - (paddle2Y+PADDLE_HEIGHT/2);
				ballSpeedY = deltaY * 0.35;
		}
		else{
			player1Score++;
			ballReset();

		}

	}

	if(ballY < 0){
		ballSpeedY = -ballSpeedY;
	}

	if(ballY > canvas.height){
		ballSpeedY = -ballSpeedY;
	}
}

function drawNet(){
	for (var i = 0;i<canvas.height; i+=40){
	colorRect(canvas.width/2-1,i,2,20,'white');

	}
}

function drawEverything(){
	//next line blanks out the screen with black
	colorRect(0,0,canvas.width,canvas.height,'green');

	if(showingWinScreen){
		canvasContext.fillStyle = 'white';

		if(player1Score >= WINNING_SCORE) {
			canvasContext.fillText("YOU WON!!",350,200);
		 }else if(player2Score >= WINNING_SCORE){
			canvasContext.fillText("YOU LOST!!",350,200);

		}

		canvasContext.fillText("click to continue",350,500);
		canvasContext.fillText("Designed by: Shyam Praveen Singh",310,550);
		return;
	}

	//this is for calling the net
	drawNet();

	//this is left player paddel
	colorRect(0, paddle1Y, PADDLE_THICKNESS, PADDLE_HEIGHT,'white');

	//this is right computer paddel
	colorRect(canvas.width-PADDLE_THICKNESS, paddle2Y, PADDLE_THICKNESS, PADDLE_HEIGHT,'white');

	//next line draws the ball
	colorCircle(ballX,ballY,10,'white');

	//text on the screen
	canvasContext.fillText(player1Score, 100,100);
	canvasContext.fillText(player2Score, canvas.width-100,100);

	}

function colorCircle(centerX, centerY, radius, drawColor){

	canvasContext.fillStyle = 'drawColor';
	canvasContext.beginPath();
	canvasContext.arc(centerX, centerY, radius, 0, Math.PI*2, true);
	canvasContext.fill();
}

function colorRect(leftX,topY, width,height, drawColor){
	canvasContext.fillStyle = drawColor;
	canvasContext.fillRect(leftX,topY, width,height);
	}

</script>
</html>